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| Number | Title | Issue Date |
| 4978959 | Analog to digital converter, a digital to analog converter and an operational amplifier therefor An operational amplifier is provided and includes at least two input terminals of one polarity and another input terminal of the opposite polarity. The amplifier includes an amplifying portion which comprises a differential section for receiving input sig... | 12/18/1990 |
| 4951053 | Method and apparatus for switching currents into the summing node of an integrating analog-to-digital converter An arrangement of switches and resistors for switching current into the summing node of an integrator uses a pair of switches for each resistor. Each resistor is connected at one end to a reference voltage. The other end of the resistor is connected to a ... | 08/21/1990 |
| 4942399 | Adaptive flash analog/digital converter for differential input signal A differential analog input signal is level-shifted and converted to single-ended form. Its average value is compared to the midpoint of a set of reference voltages. A control signal proportional to the average value forces the average of the single-ended... | 07/17/1990 |
| 4935740 | Digital-to-analog converter A digital-to-analog converter which comprises an input terminal (1) for receiving a digital input signal, an output terminal (2) for supplying the analog output signal, a current source circuit (3) having N current sources (I1 to IN) for gener... | 06/19/1990 |
| 4931795 | Digital to analog signal converter A D to A converter comprising a series of stages each including a current mirror having an input and an output transistor (Q1 and Q3) and a current adjusting transistor (Q2, Q4) connected in parallel with each input and output transistor for adjusting the... | 06/05/1990 |
| 4926176 | Self-timing analog-to-digital converting system A substantially constant current is divided between two lines in accordance with the relative values of an input voltage and a reference voltage respectively introduced to such lines. The currents through the first and second lines respectively charge fir... | 05/15/1990 |
| 4896157 | Digital to analog converter having single resistive string with shiftable voltage thereacross A digital to analog converter comprises a plurality of resistors coupled in series, having first and second nodes at the repsective ends of the plurality of resistors coupled in series and a plurality of nodes, one each between each of the plurality of re... | 01/23/1990 |
| 4893122 | Parallel analog to digital converter employing sample and hold stages A parallel analog to digital converter and a method of processing at least two independnet signals therein are disclosed in accordance with the teachings of the present invention. The analog to digital converter has an improved sample and hold stage which... | 01/09/1990 |
| 4745395 | Precision current rectifier for rectifying input current A current rectifier is provided and generally comprises: a p-channel transistor and an n-channel transistor having common gates connected to ground and common sources connected to an input current Iin ; and a first current mirror with its input... | 05/17/1988 |
| 4689607 | Bidirectional transconductance amplifier An apparatus for converting an input voltage into a related output current, is disclosed and generally comprises: a resistance means in series with the voltage input; first and second double output current mirrors, wherein each output of the first double ... | 08/25/1987 |
| 4675651 | High speed analog digital converter of the dichotomizing type A dichotomizing, high speed analog - digital comprises an input stage for the voltage - current conversion of the analog signal, a reference current source, a sequence of N-1 identical cells in series, each comprising a comparator and current dividers, a ... | 06/23/1987 |
| 4667180 | Continuous time domain analog-digital converter A continuous time domain parallel analog to digital converter is provided for accomplishing the general successive rectification algorithm Iout =2|Iin |-Iref. One stage of the continuous parallel converter comprises a comp... | 05/19/1987 |
| 4647904 | Folding-type analog-to-digital converter A folding-type A/D converter for converting an analog input signal to an n-bit digital code, the A/D converter having a transfer function dividing the analog input signal into at least n-1 segments, each such n-1 segment having an amplitude level correspo... | 03/03/1987 |
| 4644325 | Low voltage, single power supply operated digital analog converter A digital to analog converter circuit includes a current supply for providing a plurality of output currents of substantially equal magnitudes, a subtractor circuit coupled with selective outputs of the current supply for producing a plurality of binary w... | 02/17/1987 |
| 4608555 | Analog to digital flash converter An analog to digital flash converter provides a multiple bit, parallel output arranged in more significant to less significant bits. The converter includes a voltage to current converter for providing an analog signal as an input current to a plurality of... | 08/26/1986 |
| 4607249 | Input level shifting circuit for low voltage digital-to-analog converter A low voltage sixteen bit digital-to-analog converter operable between +5 and -5 volt power supplies and capable of providing output voltage levels to within about 1.4 volts of +VCC and -VCC includes an input level shifting circuit t... | 08/19/1986 |
| 4595912 | Integrated circuit for generating a terminal voltage adjustable by a digital signal An integrated circuit is described which includes a digital/analog converter which together with a reference voltage generator and a current-to-voltage converter is driven by a single supply voltage. To obtain a variable output voltage from a second suppl... | 06/17/1986 |
| 4594577 | Current mirror digital to analog converter An integrated circuit digital to analog converter comprised of MOS current mirrors and utilizing additional MOS devices to provide transmission gates and control means. Each transmission gate 36 is connected to a source of digital data to be converted and... | 06/10/1986 |
| 4583076 | Integrable digital/analog converter An integrable digital/analog converter in bipolar technology for bits of a digital data word signal to be processed, includes individual converter stages assigned to bits of the signal to be processed, the stages each including a constant current-source t... | 04/15/1986 |
| 4574270 | Analog-to-digital current converter An analog-to-digital current converter comprises n series-connected stages which each provide one bit of the Gray code. For this purpose each stage m derives a difference current from the input current (ii/m), which is the output current (i | 03/04/1986 |
| 4573005 | Current source arrangement having a precision current-mirror circuit In a digital-to-analog converter (1) a plurality of binary weighted currents are generated, which currents must be in an accurate current ratio relative to each other. By means of a coupling network (15) which is controlled by a control circuit (17), a pl... | 02/25/1986 |
| 4573036 | Integrable circuit for digital-to-analog converter Integrable circuit for digital/analog converters wherein individual signal inputs addressed by part of a digital signal to be processed are connected to the same first terminal of a respective first diode, the first diode having a second terminal connecte... | 02/25/1986 |
| 4431986 | Digital to analog and analog to digital converters with bipolar output signals A digital to analog converter (100) utilizes a current mirror connected to a reference voltage (VREF) to generate a constant reference current (IREF). A voltage divider (R1 and R2) is used in conjunction with a ... | 02/14/1984 |
| 4408190 | Resistorless digital-to-analog converter using cascaded current mirror circuits A digital-to-analog (D/A) converter comprises a plurality of current mirror circuits, a plurality of current switch circuits actuated in response to a digital input signal, and a constant current source.... | 10/04/1983 |
| 4384274 | Current mirror digital to analog converter An integrated circuit digital to analog converter comprised of MOS current mirrors and utilizing additional MOS devices to provide transmission gates and control means. Each transmission gate 36 is connected to a source of digital data to be converted and... | 05/17/1983 |
| 4381497 | Digital-to-analog converter having open-loop voltage reference for regulating bit switch currents An open-loop voltage reference circuit, adapted to regulate a plurality of bit switch currents within a digital-to-analog converter, includes a zener diode reference leg for developing a reference voltage. The reference leg also includes a base-emitter ju... | 04/26/1983 |
| 4379285 | Analog to digital converter An analog to digital conversion circuit of the stage by stage, successive approximation type which incorporates a plurality of cascaded stages. Each stage comprises a mirror current generator for generating first and second mirror currents of the same mag... | 04/05/1983 |
| 4282515 | Analog to digital encoding system with an encoder structure incorporating instrumentation amplifier, sample and hold, offset correction and gain correction functions A new encoder for an analog to digital converter of the successive approximation type incorporates instrumentation amplifier and signal sample and hold functions within the encoder proper, thereby substantially simplifying the converter circuitry. An inpu... | 08/04/1981 |
| 4231020 | Digital to analog converter having separate bit converters This invention relates to a digital to analog converter in general and specifically to unitary or monolithic miniature digital to analog converters designed to be fully embodied on a single one-half inch module without requiring external converter compone... | 10/28/1980 |
| 4064506 | Current mirror amplifiers with programmable current gains A current mirror amplifier in which at least one of the mirroring transistors is a composite transistor in which the number of simple transistors parallelled to form the composite transistor can be selected in response to a digital signal to program the c... | 12/20/1977 |
| 4045793 | Digital to analog converter An MOS digital to analog converter on a semiconductor chip includes N digital inputs and a single analog output. The digital inputs control circuitry which switches in various combinations of 20 +21 +...2N-1 IGFETs with su... | 08/30/1977 |
| 4023160 | Analog to digital converter An analog to digital converter includes a plurality of current sources selectively coupled to a capacitor for charging the capacitor from a reference level with a first reference current in a fixed time period and for discharging the capacitor with a seco... | 05/10/1977 |
